Bio or BIO may refer to:
Biology is a natural science concerned with the study of life and living organisms, including their structure, function, growth, evolution, distribution, identification and taxonomy.
A biofuel is a fuel that is produced through contemporary biological processes, such as agriculture and anaerobic digestion, rather than a fuel produced by geological processes such as those involved in the formation of fossil fuels, such as coal and petroleum, from prehistoric biological matter.
Biodiversity, a portmanteau of "biological diversity," generally refers to the variety and variability of life on Earth.
The BIOS (/ˈbaɪ.ɒs/, an acronym for Basic Input/Output System and also known as the System BIOS, ROM BIOS or PC BIOS) is a type of firmware used to perform hardware initialization during the booting process (power-on startup) on IBM PC compatible computers, and to provide runtime services for operating systems and programs.
BioShock is a first-person shooter video game developed by 2K Boston (later Irrational Games) and 2K Australia, and published by 2K Games.
Biogas typically refers to a mixture of different gases produced by the breakdown of organic matter in the absence of oxygen.
Biochemistry, sometimes called biological chemistry, is the study of chemical processes within and relating to living organisms.
Biodiesel refers to a vegetable oil – or animal fat-based diesel fuel consisting of long-chain alkyl (methyl, ethyl, or propyl) esters.